Figure 5. (a) XRD patterns of the PVDF-Trfe, PVDF-Trfe/CNT and
PVDF-Trfe/CNT/BTO piezoelectric films. (b) Surface SEM image of
the PVDF-Trfe/CNTs/BTO piezoelectric film. (c) Open-circuit
voltage and (d) short-circuit current of the PVDF-Trfe,
PVDF-Trfe/CNT and PVDF-Trfe/CNT/BTO piezoelectric films, respectively.